I'm working on a book about stuttering at the moment, so I've been reading a lot. (I also have a stutter, for what it's worth, and I'd qualify my stutter as "successfully managed.") If you stutter past adolescence, you will always be at risk of stuttering. The neuroscience behind stuttering backs this up. However, with speech therapy and the assertiveness you can decrease your dysfluency nearly to zero; but you'll still have to manage your fluency and you'll still have bad days. There's a lot of information to go through - which is why I'm writing a full-length book about it - but [this](https://www.researchgate.net/profile/Walter_Manning/publication/7964363_A_phenomenological_understanding_of_successful_stuttering_management/links/59dd3e91458515f6efef48fb/A-phenomenological-understanding-of-successful-stuttering-management.pdf) research article is a great start. If you like it, check out Dr. Plexico's articles from 2009 on coping responses to stuttering. (Search "Laura Plexico" on Google Scholar, go to her profile page and look for the articles from 2009.)